Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P025A 00: Fuel Pump Control Module Enable CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Fuel Pump Control Module Enable | P025A | P025A | P025A | -- |
Circuit/System Description
The engine control module (ECM) supplies a high voltage signal to the fuel pump control module (FPCM) when the ECM detects that the ignition is on. The high voltage signal from the ECM to the FPCM remains active for two seconds, unless the engine is in crank or run. While this signal is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Battery voltage is greater than 11.5 volts. |
Conditions for Setting the DTC
The FPCM detects a fault on the fuel control enable signal circuit.
Action Taken When the DTC Sets
DTC P025A is an A type DTC.
Conditions for Clearing the DTC
DTC P025A is an A type DTC.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Important: Repair all U-codes before performing this diagnostic.
- Ignition OFF, disconnect the harness connectors at the ECM X1 and the FPCM.
- Ignition ON, test for 0 volts between the FPCM harness connector terminal 13 and ground.
- Ignition OFF, test for infinite resistance between the FPCM harness connector terminal 13 and ground.
- Ignition OFF, test for 1.0 ohm or less between the ECM harness connector X1 terminal 50 and FPCM harness connector terminal 13.
- Reconnect the harness connectors at the ECM and the FPCM. Within 2 seconds of ignition ON, with a scan tool, verify that the Fuel Pump Command parameter displays ON.
- If all circuits test normal, replace the FPCM.
| ⇒ | If greater than the specified voltage, test the fuel control enable signal circuit for a short to voltage. |
| ⇒ | If less than the specified range, test the fuel control enable signal circuit for a short to ground. |
| ⇒ | If greater than the specified range, test the fuel control enable signal circuit for an open/high resistance. |
| ⇒ | If the parameter does not display ON within the 2 seconds of ignition ON, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM or FPCM replacement, setup, and programming
